expat: 2.4.5 -> 2.4.6

[hartwork]

Motivation for this change

• Fix regression in Expat 2.4.5 (see expat: 2.4.4 -> 2.4.5 #160826 (comment))
• Get staging PRs out of the red zone (see expat: 2.4.4 -> 2.4.5 #160826 (comment))

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 22.05 Release Notes (or backporting 21.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.

[SuperSandro2000]

Thank you very much!

[SuperSandro2000]

@hartwork I still want to encourage you to add yourself as a maintainer to this package. You already did a lot in recent history and if you not always have the time there are other people who can jump in like they already did.

[vcunat]

I see this regression: https://hydra.nixos.org/log/mf45kyxlsnlan090qbi4xs8s7bbgg4lc-python3.9-xmltodict-0.12.0.drv

I reproduce it locally. The package has no maintainers in NixPkgs.

[hartwork]

I see this regression: https://hydra.nixos.org/log/mf45kyxlsnlan090qbi4xs8s7bbgg4lc-python3.9-xmltodict-0.12.0.drv

@vcunat thanks for bringing this to my attention. I have create a ticket with xmltodict upstream about the issue at martinblech/xmltodict#289 just now.

[vcunat]

Another python package: https://hydra.nixos.org/log/lqmml3l0bx76q93z53glaajm1dqdkfjx-python3.9-jxmlease-1.0.3.drv

EDIT: I haven't looked into details of the failure, but I see no mention or fix upstream so far.

[hartwork]

@vcunat thanks for bringing jxmlease to attention 👍

[hartwork]

@vcunat libexpat/libexpat#577

[vcunat]

Uh, well the main complication I see is that expat changes are very expensive for NixPkgs.

[hartwork]

@vcunat I didn't mean to suggest application of that pull request in NixPkgs prior to a release. My intention behind sharing that link was to highlight that a fix has been in the making upstream. But maybe I'm misreading your reply?

[vcunat]

Release or not, the expense here will be the same. But maybe in the end that will be easier than fixing all the broken reverse dependencies, given that human time is scarce.

[vcunat]

#162889